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Terahertz thickness determination with interferometric vibration correction for industrial applications
Optics Express
|May 27, 2018
Summary
This study introduces an interferometer-based vibration correction for terahertz time-domain measurements. This technique significantly improves thickness accuracy in industrial settings by reducing distortions caused by vibrations.
Area of Science:
- Optics and Photonics
- Materials Science
- Industrial Metrology
Background:
- Accurate thin-layer thickness measurement is vital for quality control in industries like automotive and painting.
- Non-destructive, contact-free terahertz techniques offer promising solutions for thickness determination.
- Vibrations in industrial environments disrupt terahertz time-domain spectroscopy (THz-TDS) measurements, reducing accuracy.
Purpose of the Study:
- To develop and present an interferometer-based system for correcting vibrations in terahertz time-domain measurements.
- To enhance the accuracy and reliability of non-destructive thin-layer thickness measurements in challenging industrial environments.
Main Methods:
- Implementation of an interferometer-based vibration correction system integrated with terahertz time-domain spectroscopy.
- Experimental validation of the system's performance under controlled vibration conditions (up to 100 Hz frequency, 100 µm amplitude).
- Numerical simulations to verify experimental findings and assess the effectiveness of the vibration correction.
Main Results:
- The interferometer-based correction reduced thickness distortion by one order of magnitude.
- Effective compensation for vibrations up to 100 Hz and amplitudes up to 100 µm was demonstrated.
- Experimental results showed excellent agreement with numerical calculations, confirming the system's accuracy.
Conclusions:
- The developed interferometer-based vibration correction is highly effective for terahertz time-domain measurements in industrial settings.
- This advancement significantly improves the precision of non-destructive thin-layer thickness measurements, addressing a key industrial challenge.
- The validated technique offers a robust solution for quality control in vibration-prone environments.
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